package com.itheima.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import com.itheima.reggie.entity.ShoppingCart;
import com.itheima.reggie.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.List;

@Slf4j
@RestController
@RequestMapping("/shoppingCart")
public class ShoppingCartController {
    @Autowired
    private ShoppingCartService shoppingCartService;


    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart) {
        log.info("购物车数据:{}", shoppingCart);

        //设置用户id,确定当前是哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);

        Long dishId = shoppingCart.getDishId();

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId, currentId);

        //判断加到购物车的是菜品还是套餐
        if (dishId != null) {
            //添加到购物车的是菜品
            queryWrapper.eq(ShoppingCart::getDishId, dishId);
        } else {
            //添加到购物车的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }

        //查询当前菜品或者套餐是否在购物车中
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);

        if (cartServiceOne != null){
            //如果已经存在,就在原来的基础上加1
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number + 1);
            shoppingCartService.updateById(cartServiceOne);
        } else {
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);
            cartServiceOne = shoppingCart;
        }
            return R.success(cartServiceOne);
    }

    @GetMapping("/list")
    public R<List<ShoppingCart>> list() {
        log.info("查看购物车");
        LambdaQueryWrapper<ShoppingCart> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        wrapper.orderByAsc(ShoppingCart::getCreateTime);
        List<ShoppingCart> list = shoppingCartService.list(wrapper);
        return R.success(list);
    }


    //取消购物车
    @PostMapping("/sub")
    public R<ShoppingCart> sub(@RequestBody ShoppingCart shoppingCart){
        //菜品或者套餐id 查询出当前ShoppingCart数据
        // 如何是菜品：select * from shopping_cart where dish_id = ? and user_id = ?
        // 如果是套餐：select * from shopping_cart where setmeal_id = ? and user_id = ?
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        long userId = BaseContext.getCurrentId();
        queryWrapper.eq(ShoppingCart::getUserId,userId);
        Long dishId = shoppingCart.getDishId();
        if (dishId!=null){//是菜品
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
        }else {//是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }
        ShoppingCart one = shoppingCartService.getOne(queryWrapper);
//进行number-1操作
        Integer number = one.getNumber();
        number--;
        one.setNumber(number);
//判断 如果number>0 修改, =0删除购物车
        if (number>0){
            // >0  update更新 update set number=? where id = ?
            shoppingCartService.updateById(one);
        }else {
            // <= 0  如何操作？ delete from shopping_cart where dish_id=? and user_id = ?
            shoppingCartService.remove(queryWrapper);
        }
        return R.success(one);

    }

    @DeleteMapping("/clean")
    public R<String> clean() {
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        shoppingCartService.remove(queryWrapper);
        return R.success("清空购物车成功");
    }
}
